Disgusted Vodacom service -not willing to help

I had acc in 2018, paid it up 13/03/2018 in full and told vodacom i was cancelling my contract, then i see on my ITC, they are asking for 0.01 cent and have put a red mark on my name for the past year.

I have tried the whole morning to 21/04/2020 to sort this out? No i have never met a a crowd that are so unhelpful and not willing to help.

Felling disgusted